Periodic jitter includes any jitter at a fixed frequency or period. It is easy to measure accurately and appears in the frequency spectrum as distinct peaks. Some good examples of periodic jitter are power supply noise and crosstalk from neighboring data lines.

Period jitter is useful in calculating timing margins in digital systems. Consider a microprocessor-based system in which the processor requires 1 ns of data setup before clock rise. If the period jitter of the clock is -1.5 ns, then the rising edge of the clock could occur before the data is valid.

In the time domain, common jitter measurements are period jitter, cycle-to-cycle jitter and accumulated jitter. Among these types of jitter, period jitter (see Figure 1 below) is generally given in datasheets.

The ADC eventually showed a period jitter as low as 250fs, the best figures proven to date for CMOS-based clocks, enabling excellent SNR of 69.3dBFS at 65MSps, 220MHz IF. The circuit has been designed in Texas Instruments’ proprietary RFSiGe1 silicon-germanium very high-speed BiCMOS process.

Period jitter is defined as the maximum deviation of any clock period from its mean clock period. It compares the length of each period to the average period of an ideal clock at a long-term average frequency of the signal. Period jitter is typically specified over a set number of clock cycles.

Period Jitter Ali Sheikholeslami ESSCIRC 2019 Tutorial: Jitter and Phase Noise Also known as Cycle Jitter, defined as difference between edge-to-edge interval (“period”) and the nominal period p k:= (t k+1 –t k)-T = T k-T = a k+1-a k Period jitter can be derived easily from absolute jitter Where do we use this? 11 of 66

Dec 10, 2004 · Clock quality is usually described by jitter or phase-noise measurements. The often-used jitter measurements are period jitter, cycle-to-cycle jitter, and absolute, otherwise known as phase or Time Interval Error jitter. Clock phase-noise measurement examines the spectrum of the clock signal.

Period Jitter is defined in JEDEC Standard 65B as the deviation in cycle time of a signal with respect to the ideal period over a number of randomly selected cycles. The JEDEC standard further specified that period jitter should be measured over a sample of 10,000 cycles. SiTime recommends measuring period jitter using the following procedure: .

Period Jitter − The period jitter measures the maximum deviation of clock period of a clock cycle in the waveform over 10,000 clock cycles. The period jitter RMS measures the standard ♦ deviation of the clock period measurements over 10,000 clock cycles.

jitter is an accumulation of the difference between the ideal clock of the clock edge and the measured signal, and it is called long-term jitter or accumulated jitter depending in the case. Period jitter expresses the variation in a clock period and intercyclic jitter the variation in the difference between the periods of adjoining clocks.